ST72561AR7-Auto datasheet(315/324 Pages) STMICROELECTRONICS

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ST72561-Auto

Important notes

Doc ID 12370 Rev 8

315/324

Important notes

24.1

All devices

24.1.1

RESET pin protection with LVD enabled

As mentioned in note 2 below Figure 135, when the LVD is enabled, it is recommended not

to connect a pull-up resistor or capacitor. A 10nF pull-down capacitor is required to filter

noise on the reset line.

24.1.2

Clearing active interrupts outside interrupt routine

When an active interrupt request occurs at the same time as the related flag or interrupt

mask is being cleared, the CC register may be corrupted.

Concurrent interrupt context

The symptom does not occur when the interrupts are handled normally, that is, when:

●

The interrupt request is cleared (flag reset or interrupt mask) within its own interrupt

routine

●

The interrupt request is cleared (flag reset or interrupt mask) within any interrupt

routine

●

The interrupt request is cleared (flag reset or interrupt mask) in any part of the code

while this interrupt is disabled

If these conditions are not met, the symptom can be avoided by implementing the following

sequence:

Perform SIM and RIM operation before and after resetting an active interrupt request

Example 1:

SIM

reset flag or interrupt mask

RIM

Nested interrupt context

The symptom does not occur when the interrupts are handled normally, that is, when:

●

The interrupt request is cleared (flag reset or interrupt mask) within its own interrupt

routine

●

The interrupt request is cleared (flag reset or interrupt mask) within any interrupt

routine with higher or identical priority level

●

The interrupt request is cleared (flag reset or interrupt mask) in any part of the code

while this interrupt is disabled

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